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Image copyright NASAImage caption Artwork: At this stage, scientists can only speculate what Ultima Thule looks like The American space agency’s New Horizons probe remains on course for its daring flyby of Ultima Thule. When the mission sweeps past the 30km wide object on New Year’s Day, it will be making the most distant ever […]

[ad_1] Image copyright NASA Image caption The aim was to sample emissions under real-world conditions Some close-quarter flying has provided new insights into aircraft pollution. US space agency-led scientists flew small, instrumented, chase planes directly in the exhaust plume of a big jet to measure the sorts of gases and particles being thrown out. The […]